CN206385230U - The system for preparing metallized pellet - Google Patents
The system for preparing metallized pellet Download PDFInfo
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- CN206385230U CN206385230U CN201621334375.2U CN201621334375U CN206385230U CN 206385230 U CN206385230 U CN 206385230U CN 201621334375 U CN201621334375 U CN 201621334375U CN 206385230 U CN206385230 U CN 206385230U
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Abstract
The utility model discloses a kind of system for preparing metallized pellet, including：Palletizing device, first palletizing device has agstone entrance, the first coal powder entrance, the first binding agent entrance and the outlet of kernel pelletizing；Second palletizing device, second palletizing device has kernel pelletizing entrance, Iron Ore Powder entrance, the second coal powder entrance, the second binding agent entrance and composite carbon containing pellet outlet, and the kernel pelletizing entrance is connected with kernel pelletizing outlet；Rotary hearth furnace, the rotary hearth furnace has composite carbon containing pellet entrance and metallized pellet outlet, and the composite carbon containing pellet entrance is connected with composite carbon containing pellet outlet.There are a large amount of spaces inside the metallized pellet prepared using the system, it is possible thereby to significantly improve the degree of metalization of metallized pellet, and energy consumption is significantly reduced, the degree of metalization for handling obtained metallized pellet through direct-reduction reaches more than 90%.
Description
Technical field
The utility model is related to chemical technology field, specifically, and the utility model is related to one kind and prepares metallized pellet
System.
Background technology
High-quality crude fuel resource is increasingly deficient in recent years, and in the case where crude fuel price rises steadily, need to develop new
Type furnace charge adapts to this situation, and the prereduced metal furnace charge that is produced by technological means of coal-based direct reduction method is to reduce
One effective measures of this dependence, degree of metalization reaches more than 80~90% persons referred to as metallic pellet, degree of metalization
Reach that 30~80% are referred to as semi metallized pellet ore deposit.Current rotary hearth furnace typically requires degree of metalization more than 90% used in smelting,
Therefore pelletizing used in rotary hearth furnace is metallized pellet.
In field of metallurgy, different technological requirements uses different carbonaceous pelletizings, common carbonaceous pelletizing used in metallurgy
Its phosphorus content is relatively low, is usually no more than 30wt%, is such as used to producing the carbonaceous pelletizing of sponge iron, and its phosphorus content is generally 10~
20wt%, it is that carbon is used in whole roasting as reducing agent that it, which is acted on,.
It is relatively low that the existing method (pelletizing process) for preparing metallized pellet makes carbonaceous pelletizing porosity, reproducibility compared with
Difference, the recovery time is longer in rotary hearth furnace, and reduction temperature is higher, it is necessary to consume a large amount of energy consumptions, easily causes the waste of energy resource.
Thus, the means for preparing metallized pellet still have much room for improvement.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality
It is to propose a kind of system for preparing metallized pellet, the metallization ball prepared using the system with a new purpose
Group is internal to have a large amount of spaces, it is possible thereby to significantly improve the degree of metalization of metallized pellet, and energy consumption is significantly reduced, through direct
The degree of metalization for the metallized pellet that reduction treatment is obtained reaches more than 90%.
In one side of the present utility model, the utility model proposes a kind of system for preparing metallized pellet.According to
Embodiment of the present utility model, the system includes：Palletizing device, first palletizing device has agstone entrance, first
Coal powder entrance, the first binding agent entrance and the outlet of kernel pelletizing；Second palletizing device, second palletizing device has interior caryosphere
Group's entrance, Iron Ore Powder entrance, the second coal powder entrance, the second binding agent entrance and composite carbon containing pellet outlet, the kernel pelletizing
Entrance is connected with kernel pelletizing outlet；Rotary hearth furnace, the rotary hearth furnace has composite carbon containing pellet entrance and metallized pellet
Outlet, the composite carbon containing pellet entrance is connected with composite carbon containing pellet outlet.
Thus, according to the system for preparing metallized pellet of the utility model embodiment by the way that agstone, first are glued
The first coal dust for tying agent and high volatile carries out mixing and the processing of the first pelletizing, obtains kernel pelletizing, further, within caryosphere
Group carries out the second pelletizing processing for core, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into interior caryosphere
The outer surface of group, and then obtain composite carbon containing pellet.Thus the composite carbon containing pellet prepared is interior in direct-reduction processing
The coal dust of high volatile first in caryosphere group can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, methane etc. and wave at high temperature
Hair property gas, the gas can form a large amount of spaces in whole composite carbon containing pellet during diffusing out kernel pelletizing,
So that the porosity increase of composite carbon containing pellet, at the same time, the coal dust of high volatile first occur gasification reaction and produce an oxidation
Carbon, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metallization ball
The degree of metalization of group.
Optionally, the first binding agent entrance is starch solution entrance.
Optionally, the second binding agent entrance is starch solution entrance.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will from description of the accompanying drawings below to embodiment is combined
Become substantially and be readily appreciated that, wherein：
Fig. 1 is the system structure diagram for preparing metallized pellet according to the utility model one embodiment；
Fig. 2 is to prepare metallized pellet using the system implementation for preparing metallized pellet of the utility model one embodiment
Method flow schematic diagram.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".In description of the present utility model,
" multiple " are meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " connected " should be interpreted broadly, for example,
Can be fixedly connected or be detachably connected, or integrally；Can be mechanical connection or electrical connection；Can be with
It is to be joined directly together, can also be indirectly connected to by intermediary, can is connection or the phase of two elements of two element internals
Interaction relation, unless otherwise clear and definite restriction.For the ordinary skill in the art, it can manage as the case may be
Solve concrete meaning of the above-mentioned term in the utility model.
In one side of the present utility model, the utility model proposes a kind of system for preparing metallized pellet, according to
Embodiment of the present utility model, with reference to Fig. 1, the system includes：First palletizing device 100, the second palletizing device 200 and rotary hearth furnace
300, wherein, there is the first pelletizing processing unit 100 agstone entrance 101, the first coal powder entrance 102, the first binding agent to enter
Mouth 103 and kernel pelletizing outlet 104；Second palletizing device 200 has kernel pelletizing entrance 201, Iron Ore Powder entrance 202, second
Coal powder entrance 203, the second binding agent entrance 204 and composite carbon containing pellet outlet 205, kernel pelletizing entrance 201 and kernel pelletizing
Outlet 104 is connected；Rotary hearth furnace 300 has composite carbon containing pellet entrance 301 and metallized pellet outlet 302, composite carbon containing pellet
Entrance 301 is connected with composite carbon containing pellet outlet 205.
Below with reference to Fig. 1, the system for preparing metallized pellet according to the utility model embodiment is described in detail：
According to embodiment of the present utility model, there is the first palletizing device 100 agstone entrance 101, the first coal dust to enter
The 102, first binding agent entrance 103 of mouth and kernel pelletizing outlet 104.It is possible thereby to which agstone, the first coal dust and first are glued
Tie agent and mixing and the processing of the first pelletizing are carried out in the first palletizing device 100, to obtain kernel pelletizing.
Inventor has found, the first pelletizing processing is carried out by using agstone and the first coal dust, after can significantly increasing
The porosity of the metallized pellet obtained in continuous direct-reduction processing, under the high temperature conditions, agstone can decompose generation two
Carbon oxide gas, volatile matter (the volatility gas such as carbon monoxide, carbon dioxide, hydrogen, methane produced is decomposed with the first coal dust
Body) while pelletizing is diffused out, so as to be internally formed hole in pelletizing, increase the porosity of metallized pellet, improve to metallization
The reduction efficiency of pelletizing.
According to embodiment of the present utility model, the species of the first binding agent is not particularly restricted, those skilled in the art
It can be selected according to actual needs, according to specific embodiment of the utility model, the first binding agent entrance is starch solution
Entrance, is thus used as the first binding agent using starch solution.Thus, it is possible to make the kernel pelletizing molding effect for preparing compared with
It is good.
According to embodiment of the present utility model, the particle diameter of agstone is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of agstone can be 75 μm.Hair
A person of good sense is found through experiments that, before the first pelletizing processing is carried out, and can significantly improve agstone is levigate follow-up in advance
Agstone decomposes the efficiency for producing carbon dioxide in direct-reduction processing, and inventor has found, agstone is levigate extremely
Particle diameter is that 75 μm of effects are preferable, if agstone particle diameter is excessive, can decompose agstone and produce carbon dioxide
It is less efficient, it is impossible to hole is effectively produced in pelletizing, and if agstone is levigate to smaller particle diameter, then can be increased
The energy consumption and cost for processing that early stage is levigate.
According to embodiment of the present utility model, the species of the first coal dust is not particularly restricted, as long as can be follow-up direct
Enough volatile matters (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane) are produced in reduction treatment so as in pelletizing
Middle to form sufficient amount of hole, those skilled in the art can be selected according to actual needs, new according to this practicality
The specific embodiment of type, the first coal dust can select at least one of lignite and jet coal.Inventor is found through experiments that, brown
The volatile matter of coal and jet coal can be met prepare kernel pelletizing the need for, follow-up direct-reduction processing in can decompose generation
A large amount of volatile matters, produce a large amount of holes, and then significantly improve the efficiency of direct-reduction processing in pelletizing.
According to specific embodiment of the utility model, the volatile matter of the first coal dust is not less than 20wt%.Inventor's discovery, such as
Really the volatile matter of the first coal dust is too low, then can not produce enough volatile matters in follow-up direct-reduction processing, cause in pelletizing
Enough holes can not be formed, and then influence the effect of direct-reduction processing.
According to embodiment of the present utility model, the particle diameter of the first coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of the first coal dust can be 1mm.Hair
A person of good sense is found through experiments that, before the first pelletizing processing is carried out, and can significantly improve the first coal dust is levigate follow-up in advance
The first coal dust decomposes the efficiency for producing volatile matter in direct-reduction processing, and inventor has found, to particle diameter is by the first coal dust is levigate
1mm effects preferably, if the first coal particle size is excessive, can make the first coal dust produce the less efficient of volatile matter, it is impossible to effectively
Ground produces hole in pelletizing, and if the first coal dust is levigate to smaller particle diameter, then can increase the energy of the levigate processing of early stage
Consumption and cost.
According to embodiment of the present utility model, the mixed proportion of agstone, the first coal dust and the first binding agent not by
Especially limitation, those skilled in the art can be selected according to actual needs, according to specific embodiment of the utility model, stone
Limestone flour, the first coal dust and the first binding agent can be according to mass ratioes 100：(20~25)：(3~5) are mixed, to carry out
The processing of first pelletizing.Inventor has found, if the supplying of agstone and the first coal dust can not be produced than too low inside pelletizing
Raw enough holes, the efficiency reduction for causing direct-reduction to handle, and if the supplying of agstone and the first coal dust is than too high,
Cost can then be increased；If the amount of allocating of the first binding agent is too low, it is molded effectively kernel pelletizing, and if first
The amount of allocating of binding agent is too high, then can influence the progress of follow-up direct-reduction processing.In consideration of it, inventor has carried out a large amount of realities
Test, and aforementioned proportion is therefrom determined, can be according to mass ratio 100 by agstone, the first coal dust and the first binding agent：(20
~25)：(3~5) best results of follow-up direct-reduction processing can be made by carrying out mixing.
According to specific embodiment of the utility model, the particle diameter for handling the kernel pelletizing prepared by the first pelletizing can
Think 3~5mm.Inventor has found, the particle diameter of kernel pelletizing is excessive or too small can directly affect the processing of follow-up second pelletizing and prepares
The particle diameter of obtained composite carbon containing pellet, and then influence the efficiency of follow-up direct-reduction processing.
According to embodiment of the present utility model, the second palletizing device 200 has kernel pelletizing entrance 201, Iron Ore Powder entrance
202nd, the second coal powder entrance 203, the second binding agent entrance 204 and composite carbon containing pellet outlet 205, kernel pelletizing entrance 201 with
Kernel pelletizing outlet 104 is connected.It is possible thereby to by kernel pelletizing and Iron Ore Powder, agstone, the second coal dust and the second binding agent
In the second palletizing device 200 progress mixing and the processing of the second pelletizing, so that caryosphere group is the composite carbon containing ball of core within obtaining
Group.
Specifically, the agstone and the first coal dust in kernel pelletizing can be in the high temperature bars in follow-up direct-reduction processing
Carbon dioxide and volatile matter (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane), the gas are produced under part
A large amount of spaces can be formed in pelletizing when diffusing out pelletizing, the porosity of pelletizing is significantly increased, while so that kernel pelletizing
In the first coal dust volatile matter and the first coal dust in gasification reaction produce CO gas be more easy to the outside of pelletizing
Diffusion, so as to enhance the reducing atmosphere inside pelletizing.Further, since having used the first coal of high volatile in interior caryosphere group
Powder, the consumption of the second higher coal dust of quality can be suitably reduced in the processing of the second pelletizing, thus, ensureing what is prepared
While phosphorus content is higher in metallized pellet, preparation cost is reduced.
According to specific embodiment of the utility model, the volatile matter content of the first coal dust contains higher than the volatile matter of the second coal dust
Amount.Thus, it is possible to while pelletizing is internally formed compared with concrete dynamic modulus in ensureing follow-up direct-reduction processing, make iron in iron ore
Reduction efficiency is higher.
According to embodiment of the present utility model, the particle diameter of the Iron Ore Powder in composite carbon containing pellet is not particularly restricted, this
Art personnel can be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of Iron Ore Powder
It can be 75 μm.Inventor had found by many experiments, before the second pelletizing processing is carried out, in advance by Iron Ore Powder is levigate can be with
The reduction efficiency of the iron in during follow-up direct-reduction is handled to Iron Ore Powder is significantly improved, inventor has found, Iron Ore Powder is levigate extremely
Particle diameter is that 75 μm of effects are preferable, if Iron Ore Powder particle diameter is excessive, the contact area of Iron Ore Powder and reducing agent can be made smaller, and then
The reduction efficiency of iron in Iron Ore Powder is reduced, and if Iron Ore Powder is levigate to smaller particle diameter, then can increase the levigate processing of early stage
Energy consumption and cost.
According to embodiment of the present utility model, the species of the second coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the second coal dust can select semi-coke and coke
At least one of.Inventor has found, using at least one of the higher semi-coke of quality and coke in the processing of the second pelletizing
The reduction efficiency to iron in Iron Ore Powder can be effectively improved.
According to specific embodiment of the utility model, the volatile matter of the second coal dust is not higher than 15wt%.Inventor's discovery, such as
Fruit effectively can not then be reduced using the coal of volatile matter too high (inferior quality) to the iron in Iron Ore Powder.
According to embodiment of the present utility model, the particle diameter of the second coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of the second coal dust can be 1mm.Hair
A person of good sense is found through experiments that, before the second pelletizing processing is carried out, and can significantly improve the second coal dust is levigate follow-up in advance
The contact area of second coal dust and Iron Ore Powder in reduction treatment, and then improve reduction efficiency of second coal dust to iron in Iron Ore Powder.
Inventor has found, the second coal dust is levigate preferable for 1mm effects to particle diameter, if the second coal particle size is excessive, can make second
The contact area of coal dust and Iron Ore Powder is too small, and then the second coal dust of influence is to the reduction efficiency of iron in Iron Ore Powder；And if by
Two coal dusts are levigate to smaller particle diameter, then can increase the energy consumption and cost of the levigate processing of early stage.
According to specific embodiment of the utility model, kernel pelletizing and the in adjustment can be passed through in the processing of the second pelletizing
The supplying of two coal dusts is 1.05~1.20 than carbon-to-oxygen ratio in the composite carbon containing pellet that controls to prepare.Inventor passes through a large amount of real
If tested it was unexpectedly observed that carbon-to-oxygen ratio is too low in composite carbon containing pellet, it can cause the Iron Ore Powder in composite carbon containing pellet can not
It is reduced sufficiently, and if making carbon-to-oxygen ratio in composite carbon containing pellet too high, then needs to improve the amount of allocating of the second coal dust of high-quality,
And then increase cost.
According to specific embodiment of the utility model, the grain of the composite carbon containing pellet prepared is handled by the second pelletizing
Footpath can be 9~15mm.Inventor has found, if the particle diameter of composite carbon containing pellet is excessive, can make composite carbon containing pellet rear
Heating surface area in continuous direct-reduction processing is smaller, so as to reduce the efficiency of direct-reduction processing.
According to embodiment of the present utility model, there is rotary hearth furnace 300 composite carbon containing pellet entrance 301 and metallized pellet to go out
Mouth 302, composite carbon containing pellet entrance 301 is connected with composite carbon containing pellet outlet 205.It is possible thereby to which composite carbon containing pellet is being turned
Direct-reduction processing is carried out in bottom stove 300, to obtain metallized pellet.
Specifically, in direct-reduction processing, the agstone in kernel pelletizing can produce carbon dioxide, first
Coal dust can produce a large amount of volatile matters (escaping gas such as carbon monoxide, carbon dioxide, the hydrogen, methane) gas and diffuse out
A large amount of spaces can be formed during kernel pelletizing in whole composite carbon containing pellet so that the porosity of composite carbon containing pellet
Increase, at the same time, the coal dust of high volatile first occur gasification reaction and produce carbon monoxide, increase the reducing atmosphere inside pelletizing
By force, so as to improve the reduction efficiency to iron in metallized pellet.
According to embodiment of the present utility model, direct-reduction processing be under 1100~1250 degrees Celsius carry out 20~
What 30min was completed.Inventor has found, be reduced directly processing temperature is too low or the time too short can make agstone in kernel pelletizing
Decomposition with the first coal dust is insufficient, it is impossible to produces enough holes, and then causes the reduction efficiency to iron in metallized pellet
Reduction；And if direct-reduction processing temperature is too high or overlong time, then can increase the energy consumption of direct-reduction processing.
Thus, according to the system for preparing metallized pellet of the utility model embodiment by the way that agstone, first are glued
The first coal dust for tying agent and high volatile carries out mixing and the processing of the first pelletizing, obtains kernel pelletizing, further, within caryosphere
Group carries out the second pelletizing processing for core, and the second relatively low coal dust of Iron Ore Powder, volatile matter and agstone are wrapped in into interior caryosphere
The outer surface of group, and then obtain composite carbon containing pellet.Thus the composite carbon containing pellet prepared is interior in direct-reduction processing
The coal dust of high volatile first in caryosphere group can produce a large amount of carbon monoxide, carbon dioxide, hydrogen, methane etc. and wave at high temperature
Hair property gas, the gas can form a large amount of spaces in whole composite carbon containing pellet during diffusing out kernel pelletizing,
So that the porosity increase of composite carbon containing pellet, at the same time, the coal dust of high volatile first occur gasification reaction and produce an oxidation
Carbon, strengthens the reducing atmosphere inside pelletizing, so as to improve the reduction effect of composite carbon containing pellet, and then improves metallization ball
The degree of metalization of group.
Understand for convenience, below with reference to Fig. 2 to the system for preparing metallized pellet using the utility model embodiment
The method that implementation prepares metallized pellet is described in detail.According to embodiment of the present utility model, this method includes：
S100：The processing of first pelletizing
In the step, agstone, the first coal dust and the first binding agent are mixed and the first pelletizing is handled, so as to
To kernel pelletizing.Inventor has found, carries out the first pelletizing processing by using agstone and the first coal dust, can significantly increase
The porosity of the metallized pellet obtained in follow-up direct-reduction processing, under the high temperature conditions, agstone can decompose generation
Carbon dioxide, volatile matter (the volatility gas such as carbon monoxide, carbon dioxide, hydrogen, methane produced is decomposed with the first coal dust
Body) while pelletizing is diffused out, so as to be internally formed a large amount of spaces in pelletizing, increase the porosity of composite carbon containing pellet, improve also
Former efficiency.
According to embodiment of the present utility model, the species of the second binding agent is not particularly restricted, those skilled in the art
It can be selected according to actual needs, can be same or different from the first binder phase.According to specific reality of the present utility model
Example is applied, the second binding agent entrance is starch solution entrance, is thus used as the second binding agent using starch solution.Thus, it is possible to make
The kernel pelletizing molding effect prepared is preferable.
According to embodiment of the present utility model, the particle diameter of agstone is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of agstone can be 75 μm.Hair
A person of good sense is found through experiments that, before the first pelletizing processing is carried out, and can significantly improve agstone is levigate follow-up in advance
Agstone decomposes the efficiency for producing carbon dioxide in direct-reduction processing, and inventor has found, agstone is levigate extremely
Particle diameter is that 75 μm of effects are preferable, if agstone particle diameter is excessive, can decompose agstone and produce carbon dioxide
It is less efficient, it is impossible to hole is effectively produced in pelletizing, and if agstone is levigate to smaller particle diameter, then can be increased
The energy consumption and cost for processing that early stage is levigate.
According to embodiment of the present utility model, the species of the first coal dust is not particularly restricted, as long as can be follow-up direct
Enough volatile matters (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane) are produced in reduction treatment so as in pelletizing
Middle to form sufficient amount of hole, those skilled in the art can be selected according to actual needs, new according to this practicality
The specific embodiment of type, the first coal dust can select at least one of lignite and jet coal.Inventor is found through experiments that, brown
The volatile matter of coal and jet coal can be met prepare kernel pelletizing the need for, follow-up direct-reduction processing in can decompose generation
A large amount of volatile matters, produce a large amount of holes, and then significantly improve the efficiency of direct-reduction processing in pelletizing.
According to specific embodiment of the utility model, the volatile matter of the first coal dust is not less than 20wt%.Inventor's discovery, such as
Really the volatile matter of the first coal dust is too low, then can not produce enough volatile matters in follow-up direct-reduction processing, cause in pelletizing
Enough holes can not be formed, and then influence the effect of direct-reduction processing.
According to embodiment of the present utility model, the particle diameter of the first coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of the first coal dust can be 1mm.Hair
A person of good sense is found through experiments that, before the first pelletizing processing is carried out, and can significantly improve the first coal dust is levigate follow-up in advance
The first coal dust decomposes the efficiency for producing volatile matter in direct-reduction processing, and inventor has found, to particle diameter is by the first coal dust is levigate
1mm effects preferably, if the first coal particle size is excessive, can make the first coal dust produce the less efficient of volatile matter, it is impossible to effectively
Ground produces hole in pelletizing, and if the first coal dust is levigate to smaller particle diameter, then can increase the energy of the levigate processing of early stage
Consumption and cost.
According to embodiment of the present utility model, the mixed proportion of agstone, the first coal dust and the first binding agent not by
Especially limitation, those skilled in the art can be selected according to actual needs, according to specific embodiment of the utility model, stone
Limestone flour, the first coal dust and the first binding agent can be according to mass ratioes 100：(20~25)：(3~5) are mixed, to carry out
The processing of first pelletizing.Inventor has found, if the supplying of agstone and the first coal dust can not be produced than too low inside pelletizing
Raw enough holes, the efficiency reduction for causing direct-reduction to handle, and if the supplying of agstone and the first coal dust is than too high,
Cost can then be increased；If the amount of allocating of the first binding agent is too low, it is molded effectively kernel pelletizing, and if first
The amount of allocating of binding agent is too high, then can influence the progress of follow-up direct-reduction processing.In consideration of it, inventor has carried out a large amount of realities
Test, and aforementioned proportion is therefrom determined, can be according to mass ratio 100 by agstone, the first coal dust and the first binding agent：(20
~25)：(3~5) best results of follow-up direct-reduction processing can be made by carrying out mixing.
According to specific embodiment of the utility model, the particle diameter for handling the kernel pelletizing prepared by the first pelletizing can
Think 3~5mm.Inventor has found, the particle diameter of kernel pelletizing is excessive or too small can directly affect the processing of follow-up second pelletizing and prepares
The particle diameter of obtained composite carbon containing pellet, and then influence the efficiency of follow-up direct-reduction processing.
S200：The processing of second pelletizing
In the step, the kernel pelletizing and the Iron Ore Powder that are prepared in S100, agstone, the second coal dust and second are glued
Agent progress mixing and the processing of the second pelletizing are tied, so that caryosphere group is the composite carbon containing pellet of core within obtaining.Specifically, kernel
Agstone and the first coal dust in pelletizing can produce carbon dioxide gas under the hot conditions in follow-up direct-reduction processing
Body and volatile matter (escaping gas such as carbon monoxide, carbon dioxide, hydrogen, methane), the gas can be with when diffusing out pelletizing
A large amount of spaces are formed in pelletizing, the porosity of pelletizing is significantly increased, while so that the volatilization of the first coal dust in kernel pelletizing
The CO gas produced with the gasification reaction in the first coal dust is divided to be more easy to spread to the outside of pelletizing, so as to enhance pelletizing
Internal reducing atmosphere.Further, since the first coal dust of high volatile has been used in interior caryosphere group, in the processing of the second pelletizing
The consumption of the second higher coal dust of quality can be suitably reduced, thus, the phosphorus content in the metallized pellet for ensureing to prepare
While higher, preparation cost is reduced.
According to specific embodiment of the utility model, the volatile matter content of the first coal dust contains higher than the volatile matter of the second coal dust
Amount.Thus, it is possible to while pelletizing is internally formed compared with concrete dynamic modulus in ensureing follow-up direct-reduction processing, make iron in iron ore
Reduction efficiency is higher.
According to specific embodiment of the utility model, for prepare composite carbon containing pellet the second binding agent species not
It is particularly limited, can be from the first binder phase with can also be different with the first binding agent.
According to embodiment of the present utility model, the particle diameter of the Iron Ore Powder in composite carbon containing pellet is not particularly restricted, this
Art personnel can be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of Iron Ore Powder
It can be 75 μm.Inventor had found by many experiments, before the second pelletizing processing is carried out, in advance by Iron Ore Powder is levigate can be with
The reduction efficiency of the iron in during follow-up direct-reduction is handled to Iron Ore Powder is significantly improved, inventor has found, Iron Ore Powder is levigate extremely
Particle diameter is that 75 μm of effects are preferable, if Iron Ore Powder particle diameter is excessive, the contact area of Iron Ore Powder and reducing agent can be made smaller, and then
The reduction efficiency of iron in Iron Ore Powder is reduced, and if Iron Ore Powder is levigate to smaller particle diameter, then can increase the levigate processing of early stage
Energy consumption and cost.
According to embodiment of the present utility model, the species of the second coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the second coal dust can select semi-coke and coke
At least one of.Inventor has found, using at least one of the higher semi-coke of quality and coke in the processing of the second pelletizing
The reduction efficiency to iron in Iron Ore Powder can be effectively improved.
According to specific embodiment of the utility model, the volatile matter of the second coal dust is not higher than 15wt%.Inventor's discovery, such as
Fruit effectively can not then be reduced using the coal of volatile matter too high (inferior quality) to the iron in Iron Ore Powder.
According to embodiment of the present utility model, the particle diameter of the second coal dust is not particularly restricted, and those skilled in the art can
To be selected according to actual needs, according to specific embodiment of the utility model, the particle diameter of the second coal dust can be 1mm.Hair
A person of good sense is found through experiments that, before the second pelletizing processing is carried out, and can significantly improve the second coal dust is levigate follow-up in advance
The contact area of second coal dust and Iron Ore Powder in reduction treatment, and then improve reduction efficiency of second coal dust to iron in Iron Ore Powder.
Inventor has found, the second coal dust is levigate preferable for 1mm effects to particle diameter, if the second coal particle size is excessive, can make second
The contact area of coal dust and Iron Ore Powder is too small, and then the second coal dust of influence is to the reduction efficiency of iron in Iron Ore Powder；And if by
Two coal dusts are levigate to smaller particle diameter, then can increase the energy consumption and cost of the levigate processing of early stage.
According to specific embodiment of the utility model, kernel pelletizing and the in adjustment can be passed through in the processing of the second pelletizing
The supplying of two coal dusts is 1.05~1.20 than carbon-to-oxygen ratio in the composite carbon containing pellet that controls to prepare.Inventor passes through a large amount of real
If tested it was unexpectedly observed that carbon-to-oxygen ratio is too low in composite carbon containing pellet, it can cause the Iron Ore Powder in composite carbon containing pellet can not
It is reduced sufficiently, and if making carbon-to-oxygen ratio in composite carbon containing pellet too high, then needs to improve the amount of allocating of the second coal dust of high-quality,
And then increase cost.
According to specific embodiment of the utility model, the grain of the composite carbon containing pellet prepared is handled by the second pelletizing
Footpath can be 9~15mm.Inventor has found, if the particle diameter of composite carbon containing pellet is excessive, can make composite carbon containing pellet rear
Heating surface area in continuous direct-reduction processing is smaller, so as to reduce the efficiency of direct-reduction processing.
S300：Direct-reduction is handled
In the step, S200 is prepared into composite carbon containing pellet and supplied to rotary hearth furnace progress direct-reduction processing, so as to
Obtain metallized pellet.Specifically, in direct-reduction processing, the agstone in kernel pelletizing can produce carbon dioxide gas
Body, the first coal dust can produce a large amount of volatile matters (escaping gas such as carbon monoxide, carbon dioxide, the hydrogen, methane) gas
A large amount of spaces can be being formed during diffusing out kernel pelletizing in whole composite carbon containing pellet so that composite carbon containing pellet
Porosity increase, at the same time, the coal dust of high volatile first occur gasification reaction produce carbon monoxide, make inside pelletizing also
Primordial Qi atmosphere strengthens, so as to improve the degree of metalization of metallized pellet.
According to embodiment of the present utility model, direct-reduction processing be under 1100~1250 degrees Celsius carry out 20~
What 30min was completed.Iron Ore Powder is prepared into after composite carbon containing pellet by progress direct-reduction processing by the above method, and then can be with
Improve reduction effect.Therefore, its direct-reduction processing only need to carry out 20~30min under 1100~1250 degrees Celsius to complete
The reduction treatment of composite carbon containing pellet, and the degree of metalization of obtained metallized pellet can reach more than 90%.
Thus, the side of metallized pellet is prepared using the system implementation for preparing metallized pellet of the utility model embodiment
Method obtains interior by the way that the first coal dust of agstone, the first binding agent and high volatile is mixed and the processing of the first pelletizing
Caryosphere group, further, within caryosphere group for core carry out the second pelletizing processing, by the second relatively low coal of Iron Ore Powder, volatile matter
Powder and agstone are wrapped in the outer surface of kernel pelletizing, and then obtain composite carbon containing pellet.Prepared by the above method
Composite carbon containing pellet direct-reduction processing in, the coal dust of high volatile first in kernel pelletizing can be produced greatly at high temperature
Measure carbon monoxide, carbon dioxide, hydrogen, the escaping gas such as methane, the gas can be with during kernel pelletizing is diffused out
A large amount of spaces are formed in whole composite carbon containing pellet so that the porosity increase of composite carbon containing pellet, at the same time, height volatilization
Divide the first coal dust to occur gasification reaction and produce carbon monoxide, strengthen the reducing atmosphere inside pelletizing, so as to improve compound contain
The reduction effect of carbon pellets, and then improve the degree of metalization of metallized pellet.
Below with reference to specific embodiment, the utility model is described, it is necessary to which explanation is, these embodiments are only
Descriptive, without limiting the utility model in any way.
Embodiment 1
The granularity of first pelletizing processing agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
Bonded for lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%), used first
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratio fully mix after
The first pelletizing processing is carried out on disk mixer, obtained kernel pellet size is 4mm；In the processing of second pelletizing, iron ore used
Powder, limestone granularity are 75 μm, and the second coal powder size is 1mm, and the second coal dust used is that (fixed carbon 83.59wt%, is waved semi-coke
Hair point 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%,
Raw material handles the kernel pelletizing prepared as core after fully mixing using the first pelletizing, is 1.1 progress second according to carbon-to-oxygen ratio
Pelletizing processing, the granularity of obtained composite carbon containing pellet is 12mm, supplies to rotary hearth furnace and carries out after composite carbon containing pellet is dried
Direct-reduction is handled, and rotary hearth furnace heating-up temperature is 1200 DEG C, and the heat time is that pelletizing degree of metalization is after 25min, roasting
90.30%, then carry out slag sluicing system.
Embodiment 2
The granularity of first pelletizing processing agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
Bonded for lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%), used first
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratios fully mix after in circle
The first pelletizing processing is carried out on disk mixer, obtained kernel pellet size is 5mm；In the processing of second pelletizing, Iron Ore Powder used,
Limestone granularity is 75 μm, and the second coal powder size is 1mm, and the second coal dust used is semi-coke (fixed carbon 83.59wt%, volatilization
Divide 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%, former
Material handles the kernel pelletizing prepared as core after fully mixing using the first pelletizing, and carrying out second according to carbon-to-oxygen ratio for 1.1 makes
Ball processing, the granularity of obtained composite carbon containing pellet is 14mm, supplies to rotary hearth furnace and is carried out directly after composite carbon containing pellet is dried
Connect reduction treatment, rotary hearth furnace heating-up temperature is 1200 DEG C, the heat time is that pelletizing degree of metalization is after 25min, roasting
91.25%, then carry out slag sluicing system.
Embodiment 3
The granularity of first pelletizing processing agstone used is 75 μm, and the granularity of the first coal dust is 1mm, the first coal dust used
Bonded for lignite (fixed carbon 31.28wt%, volatile matter 27.13wt%, ash content 12.6wt%, sulphur 0.47wt%), used first
Agent is starch solution, agstone, the first coal dust and the first binding agent in mass ratio 100:20:3 ratio fully mix after
The first pelletizing processing is carried out on disk mixer, obtained kernel pellet size is 5mm；In the processing of second pelletizing, iron ore used
Powder, limestone granularity are 75 μm, and the second coal powder size is 1mm, and the second coal dust used is that (fixed carbon 83.59wt%, is waved semi-coke
Hair point 6.05wt%, ash content 9.08wt%, sulphur 0.51wt%), the second binding agent used is starch solution, and addition is 5wt%,
Raw material handles the kernel pelletizing prepared as core after fully mixing using the first pelletizing, is 1.2 progress second according to carbon-to-oxygen ratio
Pelletizing processing, the granularity of obtained composite carbon containing pellet is 14mm, supplies to rotary hearth furnace and carries out after composite carbon containing pellet is dried
Direct-reduction is handled, and rotary hearth furnace heating-up temperature is 1250 DEG C, and the heat time is that pelletizing degree of metalization is after 30min, roasting
93.05%, then carry out slag sluicing system.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (3)
1. a kind of system for preparing metallized pellet, it is characterised in that including：
First palletizing device, first palletizing device has agstone entrance, the first coal powder entrance, the first binding agent entrance
With the outlet of kernel pelletizing；
Second palletizing device, second palletizing device has kernel pelletizing entrance, Iron Ore Powder entrance, the second coal powder entrance,
Two binding agent entrances and composite carbon containing pellet outlet, the kernel pelletizing entrance are connected with kernel pelletizing outlet；
Rotary hearth furnace, the rotary hearth furnace has composite carbon containing pellet entrance and metallized pellet outlet, and the composite carbon containing pellet enters
Mouth is connected with composite carbon containing pellet outlet.
2. the system of metallized pellet is prepared according to claim 1, it is characterised in that the first binding agent entrance is shallow lake
Powder solution inlet.
3. the system of metallized pellet is prepared according to claim 1, it is characterised in that the second binding agent entrance is shallow lake
Powder solution inlet.
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| CN106702153A (en) * | 2016-12-06 | 2017-05-24 | 江苏省冶金设计院有限公司 | Method and system for preparing metallized pellets |
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